Oscillatory convection in a horizontal porous layer saturated with a viscoelastic fluid

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作者
Do-Young Yoon
Min Chan Kim
Chang Kyun Choi
机构
[1] Kwangwoon University,Department of Chemical Engineering
[2] Cheju National University,Department of Chemical Engineering
[3] Seoul National University,School of Chemical Engineering
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关键词
Porous Layer; Viscoelastic Liquid; Oscillatory Instabilities; Stationary Convection; Darcy-Rayleigh Number;
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摘要
When a horizontal porous layer saturated with a viscoelastic liquid is heated from below, the onset conditions of thermal convection are found to be functions of Darcy-Rayleigh number, wave number, and viscoelastic properties. In this study, the linear stability was studied analytically in order to investigate the viscoelastic effects of saturated liquids on the onset conditions in connection with oscillatory instabilities at the threshold of stationary convection. It is suggested that the resulting oscillatory instabilities occur at lower values of Darcy-Rayleigh number than the critical value for the stationary convection. From the occurrence of oscillatory instabilities of viscoelastic liquid, it is expected that the periodic motion should be replaced by stationary modes in a horizontal porous layer.
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页码:27 / 31
页数:4
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